US7691296B2 - Method for stabilizing active components using polyol/polymer microcapsule, and cosmetic composition containing the microcapsule - Google Patents

Method for stabilizing active components using polyol/polymer microcapsule, and cosmetic composition containing the microcapsule Download PDF

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US7691296B2
US7691296B2 US10/716,877 US71687703A US7691296B2 US 7691296 B2 US7691296 B2 US 7691296B2 US 71687703 A US71687703 A US 71687703A US 7691296 B2 US7691296 B2 US 7691296B2
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enzyme
polyol
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US20040108608A1 (en
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Hee Kyung Ju
Jin Woong Kim
So Mi Lee
Sang Hoon Han
Ih Seop Chang
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Amorepacific Corp
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Priority claimed from KR1020030019384A external-priority patent/KR101096374B1/ko
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/67—Vitamins
    • A61K8/676—Ascorbic acid, i.e. vitamin C
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/11—Encapsulated compositions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/34—Alcohols
    • A61K8/345—Alcohols containing more than one hydroxy group
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
    • A61K8/4986—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with sulfur as the only hetero atom
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/64—Proteins; Peptides; Derivatives or degradation products thereof
    • A61K8/66—Enzymes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • A61K8/8117—Homopolymers or copolymers of aromatic olefines, e.g. polystyrene; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
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    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
    • A61K8/86—Polyethers
    • A—HUMAN NECESSITIES
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
    • A61K8/97—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives thereof
    • A61K8/9706—Algae
    • A61K8/9711—Phaeophycota or Phaeophyta [brown algae], e.g. Fucus
    • A—HUMAN NECESSITIES
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
    • A61K8/97—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives thereof
    • A61K8/9706—Algae
    • A61K8/9717—Rhodophycota or Rhodophyta [red algae], e.g. Porphyra
    • A—HUMAN NECESSITIES
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    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
    • A61K8/97—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives thereof
    • A61K8/9783—Angiosperms [Magnoliophyta]
    • A61K8/9789—Magnoliopsida [dicotyledons]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B01J13/06—Making microcapsules or microballoons by phase separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B01J13/06—Making microcapsules or microballoons by phase separation
    • B01J13/12—Making microcapsules or microballoons by phase separation removing solvent from the wall-forming material solution
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/41—Particular ingredients further characterized by their size
    • A61K2800/412—Microsized, i.e. having sizes between 0.1 and 100 microns
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/52—Stabilizers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2984—Microcapsule with fluid core [includes liposome]

Definitions

  • the present invention relates to a method for stabilizing enzyme and water- and oil-soluble active components using polyol/polymer microcapsules, and to a cosmetic composition containing the enzyme and the microcapsules. More particularly, the present invention relates to polyol/polymer microcapsules that effectively stabilize the enzyme and active components, which are unstable in the formulations, through increasing the solubility thereof in hydrophobic polymer by using polyol, and to a method for preparing the polyol/polymer microcapsules.
  • various active components of a cosmetic composition have excellent effects such as improving wrinkling of the skin, whitening effect, reinforcing moisturization and antioxidation, but their application has been restricted because they are easily deteriorated through contact with external stimulants such as air or moisture, for example, discoloration, change of scent or the like. Therefore, stabilization of the enzyme is actively studied.
  • active components have been capsulized to be blocked it from external stimulation.
  • Polymers have been mainly employed to capsulize the active components.
  • Methods for capsulizing the active components using polymers include interfacial polycondensation, spray dry, coacervation, solvent evaporation or the like. Using such methods, an oil-soluble component is generally collected in hydrophobic polymer and a water-soluble component is generally collected in hydrophilic polymer.
  • Jeffery et al. suggested double emulsion-solvent evaporation techniques (1993).
  • This method capsulizes a water-soluble component more stably than simple w/o emulsion-solvent evaporation techniques, but it has a low collection rate because the water-soluble component is diffused into an aqueous media.
  • Remunan-Lopez et al. suggested a multinuclei microcapsule that capsulizes oil- and water-soluble components at the same time by using chitosan (Eur. J. Pharma. Biopharma., 1998, 45, p.49).
  • microcapsules can be produced only when the following preconditions are satisfied: an inside aqueous phase should be viscous, an active component to be contained should be dispersed and perfectly dissolved in a concentrated solution of chitosan, an organic phase should be polymer dilute solution, and the organic solvent and the polymer should not be activated with chitosan.
  • a method for simultaneously capsulizing oil- and water-soluble components in liposome (not polymer) is disclosed in Korean Patent Publication No. 1993-211990.
  • the liposome has a merit of capsulizing an oil- and a water-soluble component at the same time, however the stability of liposome in a cosmetic formulation has not yet been verified
  • the inventors of the present invention made an effort to invent a stabilized transfer system that increases the solubility of an active component without changing the physical properties of a polymer, and can block denaturation of an enzyme. As a result, the inventors discovered that a polyol/polymer microcapsule is suitable to stabilize an enzyme and an active component, and completed the present invention.
  • the object of the present invention is to provide a polyol/polymer microcapsule which can stabilize at least one of the oil- and water-soluble components in the microcapsule.
  • Another object of the present invention is to provide a polyol/polymer microcapsule which can stably contain an enzyme using a low-molecular and a high-molecular weight polyol and polymer solution, and provides a method for preparing the microcapsule.
  • the present invention provides a cosmetic composition containing the polyol/polymer microcapsule in order to maintain efficacy of an active component and an enzyme for a long time.
  • FIG. 1 shows an optical microscopic photograph of polyethyleneglycol (400 g/mol)/polycaprolactone (8000 g/mol) microcapsules.
  • FIG. 3 shows an optical microscopic photograph of polyethyleneglycol/polycaprolactone microcapsules containing papain.
  • FIG. 4 shows a scanning electron microscopic photograph of polyethyleneglycol/polycaprolactone microcapsules containing papain.
  • the present invention provides a polyol/polymer microcapsule stably containing an enzyme using a low-molecular and a high-molecular weight polyol and polymer solution, and a method for preparing the microcapsule.
  • a method for preparing polyol/polymer microcapsules according to the present invention comprises the following steps of:
  • the polymer solution of step 1) may contain wall-component polymer for microcapsule.
  • the low and the high molecular weight polyol are mixed, and the mixture is dissolved in a polymer solution prepared by dissolving wall-component polymer in a solvent.
  • the amount of the sum of low molecular weight polyol and high molecular weight polyol and the amount of wall-component polymer contained in the polymer solution may be controlled according to the thickness of the wall material, and preferably the same.
  • the mixture of polyols and the wall-component polymer are respectively employed in about 20 wt % to the solvent.
  • the resulting solution is poured into an aqueous solution containing an stabilizer and emulsified by a homogenizer.
  • the resulting emulsion is stirred in a vacuum evaporator under reduced-pressure for 10 ⁇ 120 min. to remove solvent.
  • the resultant is then filtered to collect microcapsules and to remove other aqueous material.
  • the collected microcapsules are completely dried in a vacuum dryer while blocking light at room temperature for 24 ⁇ 48 hours.
  • the present invention provides a microcapsule containing not only oil- but also water-soluble active components produced by using amphiphilic polyol, and provides a cosmetic composition containing the microcapsule.
  • the cosmetic composition of the present invention can contain such active components as licorice and ascorbic acid that have been restricted in their use in cosmetic compositions due to their decreased stability and discoloration through contact with high temperatures, moisture or air, because the microcapsule can prevent a reduction of the efficiency of the active component by collecting the active component in the polyol/polymer microcapsule.
  • a method for preparing microcapsules containing an active component according to the present invention may comprise the following steps of:
  • polyol is dissolved in a solvent at a mixing ratio of polyol to solvent of 0.05:1 ⁇ 1:1, then the oil- and water-soluble active components are added to the resulting solution.
  • the mixed solution is added to the polymer solution, stirred and dispersed by a magnetic stirrer, and emulsified at room temperature for 5 min, at 5,000 rpm to collect an emulsion.
  • the polyol and the solvent are removed from the emulsion while stirring under reduced-pressure, then a hard polyol/polymer microcapsules are produced.
  • the microcapsules according to the present invention can stably collect an oil- and a water-soluble component at the same time through a simple manufacturing process using polyol when preparing the microcapsules.
  • the active component is dissolved or completely dispersed in a solvent.
  • the present invention manifolds the active component that is able to be collected into the polymer by using amphiphilic polymer.
  • Active components which can be collected into the polyol/polymer microcapsule of the present invention include those able to dissolve in polyol, polymer solvent, or a mixing solution of polyol and polymer; for example, oil-soluble active components including retinol, retinyl acetate, retinyl palmitate, tocopherol, tocopheryl acetate, tocopheryl linoleate, tocopheryl nicotinate, linoleic acid, coenzyme Q-10, resveratrol, lipoic acid and licorice extract; water-soluble active components including ascorbic acid and derivatives thereof, and chlorogenic acid.
  • the present invention may employ one or more of the above active components.
  • the polyol used in the present invention increases the solubility of the active component and stabilizes the active component by forming a polyol domain in the microcapsule.
  • the polyol includes polyethylene glycol, polypropylene glycol, and copolymers and derivatives thereof; and compounds comprising low molecular weight alcohol, such as butylenes glycol, propylene glycol or glycerin.
  • the amount of the polyol is preferably about 0.1 ⁇ 70 wt % to the total polymer weight. If the amount of the polyol is less than 0.1 wt %, the active component is difficult to disperse efficiently and if the content of the polyol is more than 70 wt %, the yield of the microcapsule decreases.
  • polyol/polymer microcapsules produced by the above method can be applied to stabilize an enzyme or a protein.
  • the techniques can be introduced other enzyme utility techniques.
  • a polyol/polymer microcapsule containing an enzyme according to the present invention may have a triple-layered constitution, in which the enzyme forms the internal nuclei, hydrophobic high molecular weight polyol surrounds the enzyme, and finally the wall-component polymer forms the outer wall.
  • a method for manufacturing a triple-layered microcapsule to stabilize an enzyme comprises the following steps of:
  • the enzyme is dispersed into a low molecular weight polyol.
  • an enzyme has partial solubility in a low molecular weight polyol.
  • an enzyme forms spherical dispersoids with relatively high wettability in a low molecular weight polyol and only the external layer of the enzyme partially dissolves therein to form enzyme/polyol mixture phase dispersed solution.
  • the enzyme/polyol dispersed solution is then re-dispersed into a polymer solution, which comprises a high molecular weight polyol, a wall-component polymer (wall material) and a solvent.
  • the enzyme phase protected with a low molecular weight polyol through the above process can stably disperse without being affected by solvent in the polymer solution.
  • the high molecular weight polyol acts as a buffer that prevents direct contact between the enzyme and the hydrophobic polymer wall material in the microcapsule.
  • the solvent is selectively removed from the resulting solution of enzyme/polyol/polymer/solvent.
  • phase separation is formed because the polyol is immiscible in the polymer.
  • the aqueous low molecular weight polyol flows out to the outer aqueous phase through external interface of the microcapsule, due to its high polarity, and high molecular weight polyol remains in the microcapsule.
  • the microcapsule is composed of triple layers in which the enzyme forms the internal nuclei, hydrophobic high molecular weight polyol surrounds the enzyme, and finally the wall-component polymer forms the outer wall.
  • the microcapsules according to the present invention used low molecular weight polyol as the template for forming the internal vesicle of the microcapsule and as the dispersion media of the enzyme, and used high molecular weight polyol as the hydrophobic dispersing agent of the enzyme and as the blocking agent to prevent the enzyme from being denatured by the polymer of the internal wall material, which is totally different from conventional simple microcapsule, and can maintain stability of the enzyme during the formulation process and long time of storage.
  • microcapsules of the present invention may be applied to pharmaceuticals or cosmetics.
  • Enzymes used in the present invention include oxidoreductase such as glucose oxidase, xanthine oxidase and D-amino acid oxidase; transferase such as transaminase and hexokinase; hydrolase such as lipase, amylase, pepsin, trypsin, urease, asparaginase and papain; lyase such as aldolase, fumarase and pectin lyase; isomerase such as lactate catal isomerase, lactate racemase and UDP-d-glucose-4-epimerase; and synthase such as aspartate ammonia lyase and DNA ligase. These enzymes may be employed singly or by mixing.
  • a mixture of a low and a high molecular weight polyol is employed.
  • the low molecular weight polyol makes the enzyme disperse completely and acts as a template which flows out to the outside of the microcapsule during the process to form the microcapsule.
  • the low molecular weight polyol may be 1000 g/mol and less of polyeter type, for example, polyethylene glycol, polypropylene glycol, copolymers or derivatives thereof; or compounds comprising a low molecular alcohol such as butylenes glycol, propylene glycol or glycerin.
  • the amount of the low molecular weight polyol is about 0.1 ⁇ 70 wt % to the total weight of the microcapsule. If the amount of the polyol is less than 0.1 wt %, it is difficult to disperse the active component efficiently and if the amount of the polyol is more than 70 wt %, the yield of the microcapsule decreases.
  • the high molecular weight polyol can provide hydrophobic distribution to an enzyme in the microcapsule and can prevent the enzyme from being denatured by the hydrophobic polymer of the wall material.
  • the hydrophobicity of the polyol increases according to the molecular weight of the polyol.
  • the molecular weight of the polyol should be high enough to increase the hydrophobic distribution effect.
  • high molecular weight polyol may be more than 1000 g/mol of polyeter wax type, for example, polyethylene glycol, polypropylene glycol, copolymers or derivatives thereof.
  • the amount of the polyol is preferably about 0.1 ⁇ 90 wt % to the total weight of the microcapsule.
  • the amount of the high molecular polyol is less than 0.1 wt %, it is difficult to expect an efficient hydrophobic distribution effect, and if the amount of the high molecular polyol is more than 90 wt %, it is difficult to form a hard microcapsule because of high concentration of polyol.
  • Polymers for wall material (wall-component polymer) of the microcapsule include biodegradable hydrophobic aliphatic polyester such as poly-L-lactic acid, poly-D,L-glycolic acid, poly-L-lactic acid-co-glycolic acid, poly-D,L-lactic acid-co-glycolic acid, polycaprolactone, polyvalerolactone, polyhydroxybutyrate, polyhydroxyvalerate, polyorthoester, and copolymers produced from monomers thereof.
  • Polymers for wall material of the microcapsule also include unsaturated carboxylic acid such as polystyrene, poly p- or m-methylstyrene, poly p- or m-ethystyrene, poly p- or m-chlorostyrene, poly p- or m-chloromethylstyrene, polystyrene sulfonic acid, poly p-, m- or t-butoxystyrene, polymethyl(meth)acrylate, polyethy(meth)acrylate, polypropyl(meth)acrylate, poly n-butyl(meth)acrylate, polyisobutyl(meth)acrylate, poly t-butyl(meth)acrylate, poly 2-ethylhexyl(meth)acrylate, poly n-octyl(meth)acrylate, polylauryl (meth)acrylate, polystearyl(meth)acrylate, poly
  • the amount of the polymer is preferably about 1 ⁇ 99.99 wt % to the total weight of the microcapsule. If the amount of the polymer is less than 1 wt %, it is difficult to form the microcapsule and if the amount of the polymer is more than 99.99 wt %, it is difficult for the enzyme to be expressed due to the lower concentration of the enzyme.
  • Solvents for the present invention may comprise any compound that has similar solubility to the polymer used, for example, linear alkan such as hexan, heptan, octan, nonan and decan; alcohol with 4 ⁇ 10 carbons such as butanol, linear or branched pentanol, hexanol, heptanol, octanol, nonanol and decanol; alkyl ester with 7 or more of cabons such as n-hexyl acetate, 2-ethylhexyl acetate, methyl oleate, dibutyl sebacate, dibutyl adipate, and 2-butyl carbamate; aliphatic ketone such as methyl isobutyl ketone and isobutyl ketone; aromatic hydrocarbon such as benzene, toluene and o- or p-xylene; and chlorides such as methylene chloride, chloroform and
  • Stabilizers for the present invention may comprise any a water-soluble polymer that can improve dispersion stability of the microcapsule in the water-soluble phase, for example, arabic, tragacanth, karaya, larch, ghatti, locust bean, guar, agar, alginate, carrageenan, furcellaran, pectin, gelatin, starch and derivatives thereof; dextran, xanthan gum and derivatives thereof produced by microorganism fermentation synthesis; and copolymer containing polyvinyl, polyacryl, polyol produced by radical or ring opening polymerization and derivatives thereof; and one or more of the polymers may be used.
  • polyvinyl alcohol may be used.
  • the amount of the stabilizer is preferably about 0.01 ⁇ 30 wt % to the weight of the microcapsule dispersed solution. If the amount of the stabilizer is less than 0.01 wt %, the microcapsule may have decreased dispersion stability and if the amount of the stabilizer is more than 30 wt %, the microcapsule may not be produced by gelation of the solution.
  • the amount of wall-component polymer for the microcapsule containing an active component is about 1 ⁇ 99.99 wt % of the total weight of the microcapsule. If the amount is less than 1%, forming the microcapsule is difficult, and if the amount is more than 99.99%, the active component is not efficiently expressed.
  • Each of the polyethylene glycols with molecular weight of 400, 4000, 8000 and 12000 g/mol was mixed with polycaprolacton (Mw 80000 g/mol) at 1:1 ratio in methylene chloride (solvent) and stirred at room temperature to make solution.
  • polycaprolacton Mw 80000 g/mol
  • Each amount of the polyethylene glycol and polycaprolacton was 15 wt % to the methylene chloride.
  • Each of the solution was dissolved into water solution of 1% polyvinyl alcohol (average saponification 89 mol %) and emulsified by mechanical homogenizer at 5000 rpm for 5 min.
  • the concentration of solution of polyethylene glycol/polycaprolacton/methylene chloride is 30 wt % in the aqueous phase.
  • the emulsion was stirred in a vacuum evaporator under reduced-pressure at room temperature to eliminate methylene chloride.
  • the dispersed solution was then filtered to collect capsule.
  • the collected microcapsules were dried in a vacuum dryer at room temperature for one day.
  • Each of the polyethylene glycols with molecular weight of 400, 4000, 8000 and 12000 g/mol was mixed with polymethylmethacrylate (Mw 75000 g/mol) at 1:1 ratio in methylene chloride (solvent) and stirred at room temperature to make solution.
  • Mw 75000 g/mol polymethylmethacrylate
  • Each amount of polyethylene glycol and polymethylmethacrylate employed was 20 wt % to the methylene chloride.
  • the following steps were same with those of Example 1 to prepare the polyethylene glycol/polymethylmethacrylate microcapsules.
  • polyethylene glycols with molecular weight of 400, 4000, 8000 and 12000 g/mol were mixed with polystyrene (Mw 100000 g/mol) at 1:1 ratio in methylene chloride and stirred at room temperature.
  • polystyrene Mw 100000 g/mol
  • Each amount of polyethylene glycol and polystyrene employed was 20 wt % to the methylene chloride. The following steps were same with those of Example 1 to prepare the polyethylene glycol/polystyrene microcapsules.
  • Papain was dispersed in 400 g/mol of low molecular polyethylene glycol.
  • the amount of the papain was 1, 3 and 5 wt % to the total weight of the capsule, respectively.
  • the resulting solution was then re-dispersed in a solution of 8000 g/mol of high molecular weight polyethylene glycol and polycaprolacton in methylene chloride.
  • the amounts of the components used in this Example are same with Example 4.
  • the following steps were same with those of Example 1 to prepare the polyethylene glycol/polycaprolacton microcapsules.
  • Butylene glycol/polymethylmethacrylate microcapsules were prepared in a similar procedure to that described in Example 2 above, except that butylene glycol was used instead of polyethylene glycol. Butylene glycol and polymethylmethacrylate (Mw 75000 g/mol) was mixed at 3:7 ratio in methylene chloride and stirred at room temperature to dissolve. Each of the butylene glycol and polymethylmethacrylate employed were 20 wt % to the methylene chloride. The following steps were same with those of Example 1 to prepare the polyethylene glycol/polymethylmethacrylate microcapsules.
  • Licorice with 5 wt % to polymer was dissolved in a mixed solution of polyethylene glycol and methylene chloride.
  • the resulting solution was mixed with polymethyl(meth)acrylate in methylene chloride.
  • the amounts of the components used in this Example are same with those of Example 2.
  • the following steps were same with those of Example 1 to prepare the polyethylene glycol/polymethylmethacrylate microcapsules.
  • Ascorbic acid with 5 wt % to polymer was dispersed in polyethylene glycol, then the dispersed solution re-dispersed in polymethylmethacrylate in methylene chloride.
  • the amounts of the components used in this Example are same with those of Example 2.
  • the following steps were same with those of Example 1 to prepare the polyethylene glycol/polymethylmethacrylate microcapsules.
  • Ascorbic acid and lipoic acid with 5 wt % to polymer were dispersed in polyethylene glycol, then the dispersed solution re-dispersed in polymethylmethacrylate in methylene chloride.
  • the amounts of the components used in this Example are same with those of Example 2.
  • the following steps were same with those of Example 1 to prepare the polyethylene glycol/polymethylmethacrylate microcapsules containing ascorbic acid and lipoic acid at the same time.
  • polyethylene glycol/polymer microcapsules prepared in Examples 1 ⁇ 3 were observed with optical microscope. As shown in FIG. 1 , the polyethylene glycol/polymer microcapsules have an average particle diameter of 5 ⁇ 20 mm and are spherical. Spherical domain of polyethylene glycol is formed inside of the each microcapsule. However, it was found that the introduction volume of the polyethylene glycol depends on the molecular weight. The introduction volume in the microcapsules according to the molecular weight of polyethylene glycol were measured quantitatively with a thin layer chromatography, and the results are shown in Table 1.
  • the introduction volume of polyethylene glycol depended on the molecular weight. As the molecular weight of polyethylene glycol increased, the introduction volume of polyethylene glycol increased because of decreasing polarity. However, the optical microscopic photograph showed that a low molecular weight polyethylene glycol can also form an internal domain. Such formation of the microcapsule and domain happens because the polyethylene glycol forms a specific domain in the microcapsule by phase separation, and then slowly flew out to the external microcapsule during the solvent removal. This behavior of the low molecular weight polyethylene glycol shows that a low molecular weight polyethylene glycol acts as a template to induce formation of an internal domain during the manufacturing process of the microcapsule. It was also found that a high molecular weight polyethylene glycol was loaded in the microcapsule irrespective of the process.
  • microcapsule containing licorice with high concentration because the solubility of licorice is limited.
  • the licorice does not absolutely dissolve in organic solvent such as methylene chloride, and does not dissolve more than 2% in polyol at 60° C. or more.
  • a microcapsule containing with 10% or more of concentration licorice was prepared by selecting and mixing suitable polyol and organic solvent at room temperature.
  • Example 8 confirmed that a water-soluble component as well as an oil-soluble component can be capsulized.
  • ascorbic acid is easily discolored and unstable in cosmetic compositions
  • the present invention capsulized ascorbic acid into polymer capsule with a simple method of a polyol/polymer microcapsule.
  • Example 9 which collected lipoic acid and ascorbic acid at the same time, confirmed that the microcapsule of the present invention is also able to collect both oil- and water-soluble active components at the same time.
  • the lipoic acid is an oil-soluble component which has an excellent antioxidation effect
  • the ascorbic acid is a water-soluble component. Effects of these two active components are maximized when they are used at the same time rather than separately (H. R. Rosenberg, R. Culik, Arch. Biochem. Biophys. 80 (1959) 86-93).
  • H. R. Rosenberg, R. Culik, Arch. Biochem. Biophys. 80 (1959) 86-93 H. R. Rosenberg, R. Culik, Arch. Biochem. Biophys. 80 (1959) 86-93.
  • the present invention confirmed that it is possible to collect two active components having different solubilities in a single microcapsule by using the manufacturing method of polyol/polymer microcapsules.
  • the amounts of active components in the microcapsules of the above Examples 7 ⁇ 9 were analized with HPLC, and collection ratios of the active components were more than 95%.
  • the polyethylene glycol/polycaprolacton microcapsule produced in Example 4 was quantitatively analized by thin layer chromatography and the result is shown in Table 2.
  • the introduction volume of polyethylene glycol into the microcapsule was found to depend on the mixing ratio of a low and a high molecular weight polyethylene glycol.
  • the optical microscopic photograph of FIG. 2 shows that the shape of the microcapsule was independent of the mixing ratio of a low and a high molecular weight polyethylene glycol. This result shows that the low molecular weight polyethylene glycol is just a template for domain forming, and the high molecular weight polyethylene glycol remains in the microcapsule.
  • FIG. 3 shows an optical microscopic photograph of a polyethylene glycol/polycaprolacton containing papain microcapsules prepared in the Example 5. Contrary to FIG. 1 , areas of the papain can be easily observed in the microcapsule.
  • FIG. 4 shows a scanning electron microscopic photograph of a polyethylene glycol/polycaprolacton containing papain microcapsules.
  • the external wall of the microcapsule was formed with smooth polycaprolacton and it was found that papain and polyethylene glycol were efficiently collected within the external wall of polycaprolacton since effluence of papain or polyethylene glycol to the outside of the microcapsule was not observed.
  • the introduction volume of papain in the microcapsules was analized as follows: 50 ml of the microcapsules containing papain were added into 1 ml of dimethylsulfoxide and incubated for an hour. 2 ml solution of 0.05% sodiumdodecylsulfate/0.01N sodiumhydroxide was added thereto the solution was and held at room temperature for one hour to dissolve polymer and enzyme completely. The resulting solution was then protein analyzed by Micro-BCA, and the result is shown in Table 3. As shown in Table 3, the method of the present invention is able to efficiently collect enzyme.
  • Activities of papain in the microcapsules were analyzed as follows: 20 ml of microcapsules containing papain was added into 1 ml of acetone and irradiated with ultrasonic waves for 10 seconds, then centrifuged at 12000 rpm for 5 min. This process was repeated three times to obtain pure enzyme. Activity of the pure enzyme was measured with UV spectrophotometer using casein as substrate at 280 nm. Activities of papain according to storage condition are shown in Table 4.
  • Papain in polyethylene glycol/polycaprolacton microcapsules showed excellent activity after long time storage. This excellent activity means that the polyol such as polyethylene glycol efficiently stabilizes enzyme in the microcapsules.
  • the polyol is suitably located between enzyme and wall-component polymer such as polycaprolacton to provide hydrophobic distribution and block direct interaction of enzyme and polymer, and therefore, to stabilize the enzyme.
  • microcapsules were employed to the following Formulation 1 ⁇ 3.
  • a soluble formulation as colorless gel was made according to the composition of the Table 5.
  • the viscosity of the soluble formulation is 4,000 cps.
  • the viscosity was measured with Brookfield (LVDVII+) at 30° C., 12 rpm.
  • the prepared samples were stored at 25° C. and 40° C. separately in an oven. After that, the samples were picked and the amount of residual active components measured with liquid chromatography. The result is shown in Table 6. As shown in Table 6, the active components in polyol/polymer microcapsules showed excellent stability in the soluble formulation.
  • a lotion was made according to the composition of the Table 7.
  • a lotion as an opaque gel was produced by dissolving the organic phase and aqueous phase completely at 70° C. and emulsifying at 7,000 rpm for 5 min.
  • the viscosity of the lotion was 2,500 cps.
  • the prepared samples were stored at 25° C. and 40° C. separately in an oven. After that, the samples were picked and the amount of residual active components measured with liquid chromatography. The result is shown in Table 8. As shown in Table 8, the active components in polyol/polymer microcapsules showed excellent stability in the emulsion.
  • the prepared samples were stored at 25° C. and 40° C. separately in an oven. After that, the samples were picked and the amount of residual active components measured with liquid chromatography. The result is shown in Table 10.
  • the active components in polyol/polymer microcapsules according to the present invention had excellent stability in a cosmetic formulations. Accordingly, the active component, which had restricted utility in cosmetic formulation, can be stably used by using the polyol/polymer microcapsule system according to the present invention.
  • the formulation containing the microcapsules prepared to collect water- and oil-soluble components at the same time in Example 9 it was found that both the water- and the oil-soluble components can to have excellent stability. This excellent stability may be the result that direct contact between the active component and external stimulation are efficiently blocked by the external wall of polymer surrounding the active component.
  • the polyol/polymer microcapsule according to the present invention is a system that efficiently introduces various active components.
  • the system is able to collect a water-soluble component, an oil-soluble component or oil- and water-soluble components at the same time in the microcapsule.
  • the polyol/polymer microcapsule containing an active component also blocks the effects on the active component of contact with detergent, oil, moisture and air through giving stability to an unstable active component. Owing to the active component not contacting directly the outside but being enclosed within the external wall of polymer, the microcapsule relaxes the stimulation of skin which occurs by direct contact of the active component with the skin.

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